forked-synapse/synapse/rest/client/v2_alpha/register.py
Kegan Dougal 83776d6219 Make v2_alpha reg follow the AS API specification
The spec is clear the key should be 'user' not 'username' and this is indeed
the case for v1. This is not true for v2_alpha though, which is what this
commit is fixing.
2016-04-14 14:52:26 +01:00

320 lines
12 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2015 - 2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from twisted.internet import defer
from synapse.api.constants import LoginType
from synapse.api.errors import SynapseError, Codes, UnrecognizedRequestError
from synapse.http.servlet import RestServlet, parse_json_object_from_request
from ._base import client_v2_patterns
import logging
import hmac
from hashlib import sha1
from synapse.util.async import run_on_reactor
# We ought to be using hmac.compare_digest() but on older pythons it doesn't
# exist. It's a _really minor_ security flaw to use plain string comparison
# because the timing attack is so obscured by all the other code here it's
# unlikely to make much difference
if hasattr(hmac, "compare_digest"):
compare_digest = hmac.compare_digest
else:
def compare_digest(a, b):
return a == b
logger = logging.getLogger(__name__)
class RegisterRestServlet(RestServlet):
PATTERNS = client_v2_patterns("/register")
def __init__(self, hs):
super(RegisterRestServlet, self).__init__()
self.hs = hs
self.auth = hs.get_auth()
self.auth_handler = hs.get_handlers().auth_handler
self.registration_handler = hs.get_handlers().registration_handler
self.identity_handler = hs.get_handlers().identity_handler
@defer.inlineCallbacks
def on_POST(self, request):
yield run_on_reactor()
kind = "user"
if "kind" in request.args:
kind = request.args["kind"][0]
if kind == "guest":
ret = yield self._do_guest_registration()
defer.returnValue(ret)
return
elif kind != "user":
raise UnrecognizedRequestError(
"Do not understand membership kind: %s" % (kind,)
)
if '/register/email/requestToken' in request.path:
ret = yield self.onEmailTokenRequest(request)
defer.returnValue(ret)
body = parse_json_object_from_request(request)
# we do basic sanity checks here because the auth layer will store these
# in sessions. Pull out the username/password provided to us.
desired_password = None
if 'password' in body:
if (not isinstance(body['password'], basestring) or
len(body['password']) > 512):
raise SynapseError(400, "Invalid password")
desired_password = body["password"]
desired_username = None
if 'username' in body:
if (not isinstance(body['username'], basestring) or
len(body['username']) > 512):
raise SynapseError(400, "Invalid username")
desired_username = body['username']
appservice = None
if 'access_token' in request.args:
appservice = yield self.auth.get_appservice_by_req(request)
# fork off as soon as possible for ASes and shared secret auth which
# have completely different registration flows to normal users
# == Application Service Registration ==
if appservice:
# Set the desired user according to the AS API (which uses the
# 'user' key not 'username'). Since this is a new addition, we'll
# fallback to 'username' if they gave one.
if isinstance(body.get("user"), basestring):
desired_username = body["user"]
result = yield self._do_appservice_registration(
desired_username, request.args["access_token"][0]
)
defer.returnValue((200, result)) # we throw for non 200 responses
return
# == Shared Secret Registration == (e.g. create new user scripts)
if 'mac' in body:
# FIXME: Should we really be determining if this is shared secret
# auth based purely on the 'mac' key?
result = yield self._do_shared_secret_registration(
desired_username, desired_password, body["mac"]
)
defer.returnValue((200, result)) # we throw for non 200 responses
return
# == Normal User Registration == (everyone else)
if not self.hs.config.enable_registration:
raise SynapseError(403, "Registration has been disabled")
guest_access_token = body.get("guest_access_token", None)
session_id = self.auth_handler.get_session_id(body)
registered_user_id = None
if session_id:
# if we get a registered user id out of here, it means we previously
# registered a user for this session, so we could just return the
# user here. We carry on and go through the auth checks though,
# for paranoia.
registered_user_id = self.auth_handler.get_session_data(
session_id, "registered_user_id", None
)
if desired_username is not None:
yield self.registration_handler.check_username(
desired_username,
guest_access_token=guest_access_token,
assigned_user_id=registered_user_id,
)
if self.hs.config.enable_registration_captcha:
flows = [
[LoginType.RECAPTCHA],
[LoginType.EMAIL_IDENTITY, LoginType.RECAPTCHA]
]
else:
flows = [
[LoginType.DUMMY],
[LoginType.EMAIL_IDENTITY]
]
authed, result, params, session_id = yield self.auth_handler.check_auth(
flows, body, self.hs.get_ip_from_request(request)
)
if not authed:
defer.returnValue((401, result))
return
if registered_user_id is not None:
logger.info(
"Already registered user ID %r for this session",
registered_user_id
)
access_token = yield self.auth_handler.issue_access_token(registered_user_id)
refresh_token = yield self.auth_handler.issue_refresh_token(
registered_user_id
)
defer.returnValue((200, {
"user_id": registered_user_id,
"access_token": access_token,
"home_server": self.hs.hostname,
"refresh_token": refresh_token,
}))
# NB: This may be from the auth handler and NOT from the POST
if 'password' not in params:
raise SynapseError(400, "Missing password.", Codes.MISSING_PARAM)
desired_username = params.get("username", None)
new_password = params.get("password", None)
guest_access_token = params.get("guest_access_token", None)
(user_id, token) = yield self.registration_handler.register(
localpart=desired_username,
password=new_password,
guest_access_token=guest_access_token,
)
# remember that we've now registered that user account, and with what
# user ID (since the user may not have specified)
self.auth_handler.set_session_data(
session_id, "registered_user_id", user_id
)
if result and LoginType.EMAIL_IDENTITY in result:
threepid = result[LoginType.EMAIL_IDENTITY]
for reqd in ['medium', 'address', 'validated_at']:
if reqd not in threepid:
logger.info("Can't add incomplete 3pid")
else:
yield self.auth_handler.add_threepid(
user_id,
threepid['medium'],
threepid['address'],
threepid['validated_at'],
)
if 'bind_email' in params and params['bind_email']:
logger.info("bind_email specified: binding")
emailThreepid = result[LoginType.EMAIL_IDENTITY]
threepid_creds = emailThreepid['threepid_creds']
logger.debug("Binding emails %s to %s" % (
emailThreepid, user_id
))
yield self.identity_handler.bind_threepid(threepid_creds, user_id)
else:
logger.info("bind_email not specified: not binding email")
result = yield self._create_registration_details(user_id, token)
defer.returnValue((200, result))
def on_OPTIONS(self, _):
return 200, {}
@defer.inlineCallbacks
def _do_appservice_registration(self, username, as_token):
(user_id, token) = yield self.registration_handler.appservice_register(
username, as_token
)
defer.returnValue((yield self._create_registration_details(user_id, token)))
@defer.inlineCallbacks
def _do_shared_secret_registration(self, username, password, mac):
if not self.hs.config.registration_shared_secret:
raise SynapseError(400, "Shared secret registration is not enabled")
user = username.encode("utf-8")
# str() because otherwise hmac complains that 'unicode' does not
# have the buffer interface
got_mac = str(mac)
want_mac = hmac.new(
key=self.hs.config.registration_shared_secret,
msg=user,
digestmod=sha1,
).hexdigest()
if not compare_digest(want_mac, got_mac):
raise SynapseError(
403, "HMAC incorrect",
)
(user_id, token) = yield self.registration_handler.register(
localpart=username, password=password
)
defer.returnValue((yield self._create_registration_details(user_id, token)))
@defer.inlineCallbacks
def _create_registration_details(self, user_id, token):
refresh_token = yield self.auth_handler.issue_refresh_token(user_id)
defer.returnValue({
"user_id": user_id,
"access_token": token,
"home_server": self.hs.hostname,
"refresh_token": refresh_token,
})
@defer.inlineCallbacks
def onEmailTokenRequest(self, request):
body = parse_json_object_from_request(request)
required = ['id_server', 'client_secret', 'email', 'send_attempt']
absent = []
for k in required:
if k not in body:
absent.append(k)
if len(absent) > 0:
raise SynapseError(400, "Missing params: %r" % absent, Codes.MISSING_PARAM)
existingUid = yield self.hs.get_datastore().get_user_id_by_threepid(
'email', body['email']
)
if existingUid is not None:
raise SynapseError(400, "Email is already in use", Codes.THREEPID_IN_USE)
ret = yield self.identity_handler.requestEmailToken(**body)
defer.returnValue((200, ret))
@defer.inlineCallbacks
def _do_guest_registration(self):
if not self.hs.config.allow_guest_access:
defer.returnValue((403, "Guest access is disabled"))
user_id, _ = yield self.registration_handler.register(
generate_token=False,
make_guest=True
)
access_token = self.auth_handler.generate_access_token(user_id, ["guest = true"])
defer.returnValue((200, {
"user_id": user_id,
"access_token": access_token,
"home_server": self.hs.hostname,
}))
def register_servlets(hs, http_server):
RegisterRestServlet(hs).register(http_server)